I think that's a great idea Francisco, I had the same thought at some point. Github Pages are much easier to edit and collaborate on,
Take a look at Jekyll, it's a great way to manage the site through templating (common header, footer...).
This would probably also replace the wiki we currently have on github, along with the user manual. I was planning on reorganizing the manual for 3.0, but I'll hold off on that for now. It would also be ideal if we could find a way to hold the manual inside the the Npgsql git repository and source it from the site - this way feature commits can contain documentation updates as well.
I say go for it! Let me know if I can lend a hand.